shithub: riscv

ref: b17ce0d9ae5205fdf1f784774fb0d0575298b083
dir: /sys/games/lib/sudoku/boards/medium-2005-04-18.su/

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6........
..854.3.7
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...15..6.
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.4..39...
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9.3.675..
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634871952
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571392648
829154763
365728194
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983467521
716285439